Question

Arrange the following in order of increasing oxidation number of C atom.
$\rm Ca_{2}, \ \rm CO_{3}^{2-}, \ \rm C_{2}O_{4}^{2-}, \ \rm C_{2}H_{4}, \ \rm CH_{4}$

Answer 1

$\rm Ca_{2}. < \ \rm C_{2}H_{4}. <. \ \rm CH_{4}$ = \ \rm CO_{3}^{2-}. <. \ \rm C_{2}O_{4}^{2-}